| 摘要 |
Novel tetrahydrofuran derivatives which are compounds of the general formula I or the N-oxides or salts thereof <IMAGE> wherein each of R1 and R2 independently represents a hydrogen atom, a halogen atom, or an optionally-substituted alkyl, cycloalkyl or aryl group, or R1 and R2 together represent an optionally-substituted alkylene group; each of R3, R4, R5 and R6, any two or more of which may be the same or different, represents a hydrogen atom, a halogen atom, a mono- or di- alkylamino group or an optionally substituted alkyl, alkoxy, alkylthio or aryl group, or R3 and R5 have one of these meanings and R4 and R6 together represent a carbon-carbon bond; R7 represents a hydrogen atom or an optionally-substituted alkyl group; each of R8 and R9 independently represents a hydrogen atom or an optionally-substituted alkyl group; and Het represents an optionally-substituted fully unsaturated ring having 5 or 6 atoms in the ring of which one is a nitrogen atom and the remainder are carbon atoms; exhibit herbicidal activity.
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